Study of the fracture process in heterogeneous materials around boreholes filled with expansion cement

Tang, Shi Bin; Huang, Runqiu; Wang, Shanyong; Bao, Chunyan; Tang, Chun’an

doi:10.1016/j.ijsolstr.2017.03.002

Cited by 52 publications

(27 citation statements)

References 25 publications

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“…e numerical results were compared with Table 1: Rock mechanical properties used in this study. Advances in Civil Engineering the laboratory results of Tang et al [11], as shown in Figure 12. Figures 12(a) and 12(b) show the test results from two different samples by Tang et al [11].…”

Section: Crack Characteristics Under the Free Boundarymentioning

confidence: 96%

“…where δ o m can be obtained by substituting Equations (11) and (14) into (6) and (7), and solving for δ o m gives…”

Section: Advances In Civil Engineeringmentioning

confidence: 99%

“…According to Tang et al [11] and De Silva et al [9], the SCA expansion process is assumed to be a static process because SCAs usually take 20 h or longer to reach its maximum expansion pressure. erefore, the loading rate of expansion pressure has very few e ects on the mechanical response of its surrounding materials.…”

Section: Sca Expansion Propertymentioning

confidence: 99%

“…e common methods of rock and concrete breaking include rock blasting [4,5], diamond wire cutting [6], controlled blasting [7], hydraulic fracturing [8], and SCAs [9]. SCAs are hopeful to be used in hard rock roof breaking in coal mines (Figure 1(a)), rock burst prevention in metal mines, oil or gas reservoir stimulation (Figure 1(b)) [10], and building demolition [11,12]. In addition, SCAs are good prospects for rock breaking in subsea tunnel projects as they do not generate vibration, harmful gas, dust, and flying rock fragments when inducing cracks [11,13].…”

Section: Introductionmentioning

confidence: 99%

“…Zhongzhe et al [22] and Jana [23] proposed a method to determine optimal SCA borehole spacing. Tang et al [11] analyzed SCA-induced crack initiation and propagation in heterogeneous materials using the RFPA software and proposed that SCA expansion pressure depends on sti ness and con ning pressure of the surrounding rock. Tang et al [24] investigated its feasibility to improve coal permeability.…”

Section: Introductionmentioning

confidence: 99%

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Study of SCA-Induced Rock Crack Propagation under Different Stress Conditions Using a Modified Cohesive Element Method

Wang

Mitri

et al. 2018

Advances in Civil Engineering

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When inducing cracks, soundless cracking agents (SCAs) do not generate vibration, harmful gas, dust, nor flying rock fragment, making them suitable for hard rock roof breaking, rock burst prevention, oil or gas reservoir stimulation, and building demolition. In this study, SCA-induced crack initiation and propagation in different stress conditions were modelled using a modified cohesive element method. A new traction-separation law for describing rock compressive shear strength was proposed. The crack length and direction in bidirectional isobaric and unequal stress fields were analyzed in detail. The crack initiation pressure and the incremental ratio of crack length to SCA expansion pressure were proposed as two indicators to evaluate the difficulty in rock breaking in deep underground. Results indicate that (1) the modified cohesive element method used in this study is feasible to model crack propagation in deep rocks; (2) the maximum expansion pressure of SCAs depends on rock elastic modulus and geostress field and should be measured under a condition similar to deep underground prior to SCA borehole spacing design; when using the SCAs with a maximum expansion pressure of 100 MPa in 600 m underground, the suggested borehole spacing is less than 220 mm; and (3) σ3 dominates the crack initiation pressure while the principal stress ratio σ3/σ1 and notch direction control the direction of crack propagation.

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Section: Crack Characteristics Under the Free Boundarymentioning

confidence: 96%

“…where δ o m can be obtained by substituting Equations (11) and (14) into (6) and (7), and solving for δ o m gives…”

Section: Advances In Civil Engineeringmentioning

confidence: 99%

Section: Sca Expansion Propertymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of SCA-Induced Rock Crack Propagation under Different Stress Conditions Using a Modified Cohesive Element Method

Wang

Mitri

et al. 2018

Advances in Civil Engineering

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Study of the Dynamic Fracturing Process and Stress Shadowing Effect in Granite Sample with Two Holes Based on SCDA Fracturing Method

et al. 2022

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Evaluation of Slow-Releasing Energy Material (SREMA) Injection for In-Situ Rock Breaking Under Uniaxial and Triaxial Loading: An Experimental Study

Manatunga,

Ranjith,

De Silva

et al. 2024

Rock Mech Rock Eng

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Permeability enhancement of impervious rock formations is crucial for the exploitation of ore deposits, which are uneconomic using conventional mining methods. These deposits have the potential to be mined with in-situ recovery (ISR) mining methods, provided the deposit’s permeability is enhanced artificially. Slow-releasing energy material (SREMA) has been identified as a promising preconditioning technique to enhance rock permeability for ISR. However, the fracturing potential of SREMA in the presence of in-situ stresses remains under-explored in laboratory experimental research studies and needs to be assessed in detail prior to field trials. A unique confining cell was developed in this study to represent realistic confining stresses underground, and the impacts of different stress conditions on the fracturing potential of SREMA were investigated. In addition, the effects of SREMA expansion in pre-existing joints were also assessed using laboratory fracturing experiments conducted by injecting SREMA into sandstone specimens with artificially created horizontal persistent joints, which is the first attempt to the best of the author’s knowledge. Under uniaxial stress conditions (10 MPa), multiple radial cracks emerged from the borehole at the centre of the specimen, while vertical splitting of the specimen was observed due to the outward expansion of SREMA inside the joint. In comparison, under triaxial confinement (5 MPa and 10 MPa), a decrease in the damage caused to the rock mass due to the expansive pressure generated by SREMA was observed, and this was overcome by introducing multiple injection holes and stress relief holes into the rock mass.

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Study of the fracture process in heterogeneous materials around boreholes filled with expansion cement

Cited by 52 publications

References 25 publications

Study of SCA-Induced Rock Crack Propagation under Different Stress Conditions Using a Modified Cohesive Element Method

Study of SCA-Induced Rock Crack Propagation under Different Stress Conditions Using a Modified Cohesive Element Method

Study of the Dynamic Fracturing Process and Stress Shadowing Effect in Granite Sample with Two Holes Based on SCDA Fracturing Method

Evaluation of Slow-Releasing Energy Material (SREMA) Injection for In-Situ Rock Breaking Under Uniaxial and Triaxial Loading: An Experimental Study

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